reilly



(No Model.) Pr. REILLY Grate Bar.

10.231.322. Patented Feb. 1,188.y

turen STATES PATRICK REILLY, OF BROOKLYN, NFNV YORK.

GRATE-BAR.

SPECIFICATION forming part of Letters `Patent No. 237,322, datedFebruary 1, 1881.

Application filed December 10, 1880.

To all whom it may concernJ Be it known that I, PATRIGK'REILLY, ofBrooklyn, county of Kings, State of New York, have invented certain newand useful Improvements in Grate-Bars, of which the following is aspecification.

This invention relates to that class of gratebars for furnaces which arecomposed of a number of cast-iron plates placed on a square or otherpolygonal-shaped rod.

It consists in making the plates rectangular in form, with semicircularopenings at their ends,leaving sufficient metal at the corners towithstand the heat of the lire for a long time.-

The semicircular openings at the ends of the plates 4of adjacent barsform longitudinal cylindrical chambers joining the transverse airspacesbetween the plates, thus providing for a free and perfectly uniformcirculation of air to all parts of the grate-surface, which is an evenplane produced by the upper edges of the plates. Each bar is adapted tobe reversed, so that both the upper and the lower edges of the platesmay alternately form the grate-surface, and the bars are tted in thefurnace in such a manner that worn plates maybe taken off the squarerods and replaced by new ones Without removing the rods from thefurnace, all of which will be fully understood by the followingdescription of the accompanying dra-wings, forming part of thisspecification, in which- Figure l is a plan view of a furnace, the barsof which are composed of square rods provided with my improved plates.Fig. 2 is a .longitudinal section of the same, showing one of the barspartly in section with some of its plates in full, and one of thegrate-bars in position to have the plates removed therefrom or placedthereon. Fig. 3 is a transverse section of Fig. l, and Fig. 4 is aperspective view of one of the plates, detached.

a represents the dead-plate, and b the back bearer, of the furnace. Theyare shown in the drawings as connected together by the side pieces, c c,but would, in ordinary circum stances, be separate, the dead-plate cbeing bolted to the front of the furnace of the boiler,

and theback-bearer resting on the back wall of the ash-pit, as is wellunderstood by those skilled in the art 'to which this inventionappertains. The square rods d d d2 pass through (No model.)

holes provided therefor ina downwardly-projecting an ge, a, ofdead-plate c. Their rear ends rest in open slots formed in thebackbearer b, and butt against the flange b. holes in the flange c andslots in the backbearer 11 are suiiciently large to allow the squarebars d d cl2 to rotate therein, and the holes in flange c are furtherenlarged to admit of the bars being raised at their rear ends, as shownat d', Fig. 2. The parts of the square bars cl d d2 between theback-bearer b and dead-plate a are entirely covered by the rectangularplates c e, the upper edges of which form a at grate-surface. The widthof the air-spaces between the plates on each of the square rods is aboutequal to the thickness of the plates, as is also the width of theair-spaces between the adjacent ends of each series of plates. Eachseries of plates with the square rod passing through their centersconstitutes a grate-bar. The form ofthe plates e e is clearly shown atFig. 4, which is a perspective view of one of them, detached. It is ofeven thickness throughout with the exception of the bosses e' esurrounding the square hole through its center, which corresponds to thecross-section of the square rods d el cl2, and it is cut away at itsends, forming the semicircular openings e2 e2, thus reducing its weightto a minimum, and at the same time providing for a perfect circulationof air by forming large longitudinal chambers between the adjacentseries of plates when placed in the furnace, as shown at Fig. 3. Thebosses e e whichdetermine the width of the air-spaces between the platese c are made as narrow as practicable on all their sides, so as toobstruct the air in circulating between the plates as little aspossible. Especiallyis this freedom of circulation necessary at thecentral part ofthe plates over the bosses e e.

Considerable metal is left at the corners e3 e3 of the plates by thesemicircular openings e2 e2 formed in their sides, thus enabling theplates to withstand long usage before burning away sufficiently to allowthe fuel to fall down between their adjacent ends. The semicircularopenings e2 e2 in the sides of the plates e e also allow the corners ofthe plates of the adjoining bars to clear when said adjoining bars arerotated.

It will be observed that the upper and lowerI The IOC)

halves of the plates are uniform in shape, thus admitting of the barsbeing reversed as often as desired, by applying a wrench to the ends ofthe rods d d d2 projecting beyond the deadplate a. The bars are alsoindependently shaken by this means.

By reason of the rear bearings of the bars being open slots the rearends of the bars may be raised, as shown at d', Fig. 2, to allow oldplates to `be slipped off the rear ends of the square rods and replacedby new plates, thus obviating the necessity of removing the bars fromthe furnace for this purpose.

Having now described my invention, I wish it understood that I do notclaim, broadly, a grate-bar composed of a series of plates placed on asupporting-rod, as such is shown and described' in Letters Patent of theUnited Sta-tes No. 213,730, dated April 1, 1879, and No. 22l,657,datedNovember 1S, 1879,granted to J. Ashcroft, and No. 216,708, dated June17, 1879, granted to F. Steele; but

What I claim, and desire to secure by Letters Patent, is

1. As an improvement in grate-bars composed of detachable plates and acentral sup porting-rod, the rectangular plates e e, provided with thesemicircular openings e2 e2 at their ends, and the uniformly narrowspacingbosses e e', in combination with the square rods d d d2,substantially in the manner shown and specified, that when placed in thefurnace the grate-surface formed thereby is a fiat plane, and theair-spaces between the plates of each bar and between the ends of theplates of adjacent bars is of uniform width throughout, as set forth.

v 2. The grate-bars composed of the rods d d d2 and detachable plates ee, in combination with the flange a', provided with holes to support thefront ends ofthe rods d d d2, and the back-bearer b, provided with openslots, substantially as and for the purpose hereinbcfore set forth.

In testimony whereof I have hereunto set my 4

